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Stockholders' Equity and Stock-Based Compensation - Summary of Activity under Incentive Plan (Details) $ / shares in Units, $ in Thousands	9 Months Ended
	Sep. 29, 2018 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract]
Outstanding, Number of Shares, Beginning Balance | shares	857,311
Number of Shares, Options Granted | shares	136,435
Number of Shares, Options Exercised | shares	(23,750)
Number of Shares, Options Cancelled or forfeited | shares	(62,286)
Outstanding, Number of Shares, Ending Balance | shares	907,710
Outstanding, Weighted Average Exercise Price Per Share, Beginning Balance | $ / shares	$ 9.49
Weighted Average Exercise Price Per Share, Options Granted | $ / shares	6.22
Weighted Average Exercise Price Per Share, Options Exercised | $ / shares	4.10
Weighted Average Exercise Price Per Share, Options Cancelled or forfeited | $ / shares	10.48
Outstanding, Weighted Average Exercise Price Per Share, Ending Balance | $ / shares	$ 9.07
Aggregate Intrinsic Value, Ending Balance | $	$ 132

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Gross number of share options (or share units) granted during the period.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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